#1
Hi,

I recently read a lesson, I think it was written by SilentDeftone about what chords are in what key, etc. Good lesson, but it left me wondering when I can use extended chords, and with which chords (whilst remaining in key).

For example; can I have a progression consisting mostly of open chords, and just throw in an obscure, complicated, extended chord whenever I want. Or can I only use extended/altered chords when they are ALL extended.

Sorry if I didn't explain that clear enough.

Thanks.
#2
you can mix and match extended and simple chords to create whatever sound YOU want to hear...
#3
if you mean what chords to play while remaining in key-depends on the additional notes added-but since things like Jazz Fusion many things may sound good and be out of key.